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The power supply board is model L20C-2 In most cases you can repair the board cheaper than you can purchase a new one. The problem is the filter capacitors go out and this keeps the back light bulbs from powering up right. If you feel like doing the repair on the board here is a link that shows the board with the bad parts circled and a parts list on the capacitors that needs to be replaced.
hramirez, Retevo. com says time to retire this old monitor. Its that or you will need to do some extensive reading here on fixya on how and what to look for inside the unit that could be causing your black screen condition!!! Then you will go to YOUTUBE and view some of the many video clips that deal with "lcd monitor repair" and lcd monitor disassembly". Have you noticed any bad, swollen top, elcetrolytic filter capacitors on the units "switch-mode-power-supply/CCFL inverter printed circuit board?? How about any "cold" frosty looking solder joints around the component leads of the power transistors and ferrite inverter transformers? May need to get large magnifying glass to find those pesky little cold solder joints. 12fixlouie
Most likely loose connection at PC. Check that monitor connector pins are not bent. Ensure that he monitor plug screws are screwed into the connector to prevent plug movement, at the PC and in the case of some monitors, also at the back of the monitor. If this does not correct the problem, there is probably a fracture in one of the solder joints on the VGA board at the connector.
If you mean to say that the computer-generated displayed image on your screen changes, it's a function of the computer, not the monitor. If you mean to say that some monitor-generated displayed image is appearing (such as a setup/configuration menu or a splash screen), please tell us more so we can diagnose further.